diff --git a/models/workflow/workflow_mongo_accessor.go b/models/workflow/workflow_mongo_accessor.go
index eaf6bd0..048fcce 100644
--- a/models/workflow/workflow_mongo_accessor.go
+++ b/models/workflow/workflow_mongo_accessor.go
@@ -92,7 +92,7 @@ func (a *workflowMongoAccessor) share(realData *Workflow, delete bool, caller *t
 func (a *workflowMongoAccessor) UpdateOne(set utils.DBObject, id string) (utils.DBObject, int, error) {
 	// avoid the update if the schedule is the same
 	set = a.verifyResource(set)
-	if set.(*Workflow).Graph.Partial {
+	if set.(*Workflow).Graph != nil && set.(*Workflow).Graph.Partial {
 		return nil, 403, errors.New("you are not allowed to update a partial workflow")
 	}
 	res, code, err := utils.GenericUpdateOne(a.verifyResource(set), id, a, &Workflow{})
@@ -109,7 +109,7 @@ func (a *workflowMongoAccessor) UpdateOne(set utils.DBObject, id string) (utils.
 func (a *workflowMongoAccessor) StoreOne(data utils.DBObject) (utils.DBObject, int, error) {
 	data = a.verifyResource(data)
 	d := data.(*Workflow)
-	if d.Graph.Partial {
+	if d.Graph != nil && d.Graph.Partial {
 		return nil, 403, errors.New("you are not allowed to update a partial workflow")
 	}
 	res, code, err := utils.GenericStoreOne(d, a)